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Subdomains generally don't pass any authority, link juice etc to the TLD, Rand did a Whiteboard Friday that briefly covered this a while ago (see http://www.seomoz.org/blog/international-seo-where-to-host-and-how-to-target-whiteboard-friday) I am curious, if you didn't want user created sites to be associated with your TLD why didn't you set up a different domain for user created sites? I personally think it is morally wrong to try and stop Google indexing them. So, if you don't want these associated with you or your TLD I would set up a new domain eg yourbreezi.com and 301 any sites that have been set up to the new domain and make sure that any new user sites are set up under the new domain. In truth I'm not sure it is too much to worry about, after all Wordpress.org uses subdomains for most of its hosted blogs and it doesn't seem to have done them too much harm!! Hope that helps

I've actually seen this question before (I looked but couldn't find the discussion) sorry. What I seen some folks offer as advice is to try and rotate your anchor text if possible. Nobody gave a solid yes or no don't do it, but most cautioned that it seemed risky. My thoughts are to try and use some dynamic anchor text, about the only thing that will be different from site to site is the domain name so.... Website Design of XXX.com By DonFord.com just use php or asp to pull the domain name for the anchor text. Furthermore, it may be prudent to create a page for the client on your site and point the link there. A simple outline of their service, and your service a few images and maybe ask the client for small snippet about the work you did for them. This would prevent kathousand links going to the same page, and still bring in traffic from people who like the site you designed. Most people probably can figure out to hit your logo or something to go to your homepage. The added benefit is it makes it easy to see how much traffic each one of these sites sends your way. My 2 cents, hope it helps.